I seached so this better not be a repost.












Creators original thread
http://www.thirdgen.org/techbb...49330


At first I hoped this was a joke or something but the guy is serious. The load cell measuring exactly how much pull is in the chains is actually a pretty clever idea and could be made accurate as it eliminates a ton of variables normal dynos must overcome. All that matters is the braking system can hold a steadily increasing rpm and as much force as possible is directed through the rear chains. As long as the load cell is pretty accurate you are only a couple equations away from your numbers. That is if you trust balancing your car on this setup

 

LMAO !! Spend the extra 50 grand and buy a dynojet...

Its cute though. Really!

 

WOW thats a crazy setup

 

damn rednecks with nothing to do

 

Man that **** looks dangerous imagine a fwd car and the chains busting

 

If it slips on a RWD the amount of damage will be far less than what would happen on a FWD.

 

damn rednecks trying to kill themselves.

 

all that **** would do is go foward. Your sig is false advertising.

 

yep, it would go forward and fall into the ditch.

false advertising? yep, exactly.

I'm going to go ahead and have your new account banned so it is like your other 5 accounts you've created.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">If it slips on a RWD the amount of damage will be far less than what would happen on a FWD.</TD></TR></TABLE>Actually no it wouldn't. Cause you could only do a FWD in reverse on it. So it would go the same way if the chains let loose.

Call it redneck if you want, but that took some serious thought and work to put together. Might be redneck but he is running the same Khumo Ecstas that a lot of poor jokers on here run.

 

It is redneck, but very crafty. I like DIY, but this is a bit on the dangerous side.

If you do not have the car properly strapped down and have the tire at the proper position, **** could happen. Dyno in reverse? lol.

 

That is one safe looking dyno!

I wouldn't even trust my riding mower on that thing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">It is redneck, but very crafty. I like DIY, but this is a bit on the dangerous side.

If you do not have the car properly strapped down and have the tire at the proper position, **** could happen. Dyno in reverse? lol.</TD></TR></TABLE>
who cares. its not like anyone is actually going to try and make this in their backyard

 

Actually, mase and I started building one like this in my backyard this weekend. It's not finished yet, but we expect it to be far more accurate than a dynapack.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">Actually, mase and I started building one like this in my backyard this weekend. It's not finished yet, but we expect it to be far more accurate than a dynapack.</TD></TR></TABLE>
shutup

 

funny pic

 

Also you can tell he has used it quite a bit. Look at the tires and see how black they are in the tread path. Must work somewhat.

Hey i think the Honda in reverse would kick ***. I bet a boosted Teg could put down some good numbers with that gear ratio! hehe

 

looks real stable &lt;------ thinking yeah right

 

You could easily make that thing safer with some platforms and bracing. I dont think anybody here knows enough about his setup to do anything more than speculate at the machines accuracy. Looks like it needs a bit more work though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mos &raquo;</TD></TR><TR><TD CLASS="quote">You could easily make that thing safer with some platforms and bracing. I dont think anybody here knows enough about his setup to do anything more than speculate at the machines accuracy. Looks like it needs a bit more work though. </TD></TR></TABLE>

The accuracy all comes down to how accurate that load cell is, its a really simple setup. If you can measure how many lbs of force there is in the rear chains accurately you know exactly how much force the car is exerting. Then if you calculate in the tire diameter and gear ratios and rpm you can get pretty accurate hp and torque numbers(for tuning all that matters in consistency anyways). The big problem is all the power needs to be focused through the rear chains so any extra straps to make this thing safer could skew the numbers. A fwd on a contraption like this would be a disaster since the steering needs a little room to be able to center itself, not to mention moving the wheel or a bad alignment would walk it right off without more straps or supports to keep in centered.

 

has anyone else that has veiwed this page had there cursor

turn into

MOO

 

I &lt;3 Grumpy.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by omahaturbocivic &raquo;</TD></TR><TR><TD CLASS="quote">any extra straps to make this thing safer could skew the numbers.
</TD></TR></TABLE>
I meant braces to secure the moving truck parts, and platforms to cover the whole shebang with a flat surface.

If this guy isnt able to measure how much energy is put into the spinning truck wheels/tires/axle than he's not going to get accurate numbers. Just measuring the load cell isnt enough. In order to figure out how much power it took to spin up the truck wheels, hes going to have to do a lot of figuring. Its not easy.

In his post on the camaro forum he says he is getting lower power number than excepted. I think its because hes not measuring the power that is used to spin up the big truck wheels. I have one of the commercially available dynos. The way it gives a total power is by adding the load cell power with the spinning drum power. You need both of these figures to get the correct total.

If I were this guy, I would separate the truck axle housing from the ground so that it can freely rotate. It would still be secured to the ground, but in a way that allows for a small amount of rotation. Then use the load cell to measure the axle housings tendency to want to rotate away from its resting position when the brake is applied. This will allow him to do away with strapping to the cars rear axle. All he would have to do is secure the car to the ground.

 

funny ****!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">damn rednecks with nothing to do </TD></TR></TABLE>